No-Liquid Cell-Core for Lithium Slurry Battery
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Solution Overview
Problem
Conventional lithium-ion batteries face challenges such as low electrode strength, limited capacity, risk of ignition and explosion during transportation, and issues with electrolyte consumption and SEI film instability, which affect their efficiency and safety for use in electric vehicles and large-scale energy storage.
Innovation Solution
A lithium slurry battery module with a no-liquid cell-core design, where positive and negative electrode pieces have electric-conductive particles in an accumulated state without adhesive bonding, forming a conductive slurry upon electrolyte injection, which enhances conductive performance, reduces internal resistance, and prevents electrode detachment, while a separating space and leakage-preventing layers improve safety and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional coating and rolling methods are used to manufacture lithium-ion pole pieces, then the manufacturing process is well-established, but the electrode thickness is limited (not more than 300 μm) and the electrode active material carried on the unit area is limited
Solution Approach 1:
The patent changes the physical state of the electrode from a coated thin film to a paste-filled porous structure. By filling electrolyte into the porous current collecting matrix, the electrode transforms from a dry coated layer to a conductive slurry state, enabling much thicker electrodes (up to several millimeters) while maintaining electrical conductivity through the liquid electrolyte medium.
Solution Approach 2:
The patent uses a porous current collecting matrix (foamed aluminum or foamed metal) as the electrode support structure. The porous structure provides high surface area and volume for accommodating large amounts of electrode active material, while the pores are filled with electrolyte to form the conductive slurry, enabling both high capacity and structural integrity.
2Reliability
If the electrode material is detached from the current collector and loses electrical connection during battery use, then the battery structure remains simple, but the battery performance significantly deteriorates
Solution Approach 1:
The patent uses the liquid electrolyte as a hydraulic bonding medium. The electrolyte fills the porous structure and provides continuous liquid-phase electrical connection between the electrode particles and the current collector, replacing traditional solid adhesive bonding. This hydraulic connection maintains reliable electrical contact even under mechanical stress or thermal expansion.
Solution Approach 2:
The patent creates a composite electrode structure combining solid electrode active material particles, porous current collecting matrix, and liquid electrolyte. This composite structure integrates multiple functions: the porous matrix provides structural support, the electrolyte provides ionic conduction and hydraulic bonding, and the electrode particles provide active material, achieving both reliability and simplified structure.
3Object-affected harmful factors
If lithium-ion batteries are designed with conventional liquid-encapsulated high-energy-density structure, then the energy density is high, but the battery is at risk of ignition and explosion during transportation when subjected to external force impact or improper protection
Solution Approach 1:
The patent uses a porous current collecting matrix with controlled pore structure that provides mechanical strength and structural integrity. The porous structure distributes external impact forces throughout the electrode volume, preventing localized stress concentration that could lead to internal short circuits or thermal runaway, while maintaining high energy density through efficient space utilization.
Solution Approach 2:
The electrolyte acts as an intermediary between the electrode particles and the external environment. It provides flexible hydraulic bonding that accommodates thermal expansion and mechanical stress, preventing electrode detachment and internal short circuits that could lead to ignition or explosion, while maintaining continuous ionic conduction for high energy density operation.
4Duration of action of stationary object
If side reactions occur during battery use due to electrode material structure and electrolyte properties, then the battery operation continues, but electrolyte and active lithium are consumed and SEI film becomes unstable, causing battery swelling and internal resistance increasing
Solution Approach 1:
The patent changes the electrode from a dry coated structure to a wet slurry structure with electrolyte-filled pores. This parameter change transforms the electrode-electrolyte interface from a thin coated layer interface to a distributed three-phase interface throughout the porous structure, improving uniformity of reactions and reducing localized SEI formation that consumes electrolyte and lithium.
Solution Approach 2:
The patent creates a homogeneous distribution of electrolyte throughout the porous electrode structure, ensuring uniform ionic concentration and electrical potential across the entire electrode. This homogeneity prevents localized side reactions and unstable SEI film formation, reducing electrolyte consumption and extending battery service life.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances the battery's cycle life, safety, and energy density, facilitates easier storage and transportation, and reduces the risk of internal short circuits, making it suitable for high-capacity applications in electric vehicles and energy storage systems.
Implementation Method 1
the conductive slurry contains a certain proportion of conductive particles that suspend or deposit in the electrolyte
Implementation Method 2
The porous structure is filled with electrolyte to form a conductive slurry
Data Source
AI summary
Provided is a no-liquid cell-core for a lithium slurry battery. The no-liquid cell-core comprises multiple positive electrode pieces and negative electrode pieces overlapping alternately. The positive electrode piece comprises an electric-conductive cathode layer and a cathode surface current-collecting layer, wherein the electric-conductive cathode layer contains a part or all of the electric-conductive cathode particles in accumulated state without adhesive bonding, and the cathode surface current-collecting layer is set on the surface of the electric-conductive cathode layer and contacted with it tightly. The negative electrode piece comprises an electric-conductive lithium-intercalatable anode layer which is a lithium-containing metal body and/or a layer containing a part or all of electric-conductive lithium-intercalatable anode particles in accumulated state without adhesive bonding. The peripheral edges of the positive electrode piece and/or the negative electrode piece are insulated and sealed. A lithium slurry battery module containing the no-liquid cell-core is also provided.